You might have read my previous thread (fatal low oxygen emergency), if not, I am currently cycling a 110 litre tank and keeping my fish in other tanks temporarily. The problem is, I need to move my guppy fry as they are disappearing (possibly being eaten) and the larger ones are getting fin nipped. I am not sure how I can safely arrange my fish so the fry are alone?

Obviously this is not ideal and once my large tank has cycled I want to put my betta and neons into the 64 litre, fry in the 30 litre and everyone else in the 110 litre if compatible. But for the time being, how can I save my fry from being eaten/fin nipping and make sure everyone has enough space? I am doing frequent water testing and large water changes.

The aquarist is one who must learn the ways of the biologist, the chemist, and the veterinarian.[unknown source]

Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If you’re going to take it under your wing then you’re responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]

Honestly, I'd not put the effort into anything there for the fry. If you have decent amount plants in there, some fry will survive. But these Guppys have so many baby's all the time, you'll have PLENTY more to come in your new set up, so don't worry!

~ Life Is Too Short, Break The Rules, Forgive Quickly, Kiss Slowly, Love Truly, Laugh Uncontrollably And Never Regret Anything that Made You Smile.
Life May Not Be The Party We Hoped For, But While We're Here, We Should Dance. ~

I've only been cycling a few days :( My 64 is already really quite overstocked, and the mollies are quite large. Do you think it is too soon to put the guppies in the 110 so I can move the fry and the betta in the net to the 30?
I will get some floating plants Byron, thank you. I am more worried about the fin nipping then the fry being eaten. Also, I have noticed at least a couple of the larger fry with deformed(?) tails, in that they kind of go to a point rather than fanning out, I am not a fan of 'culling' fish but I don't want them to breed obviously, is there anything I can do short of getting yet more tanks and separating them? How old must guppies be before they can breed?

~ Life Is Too Short, Break The Rules, Forgive Quickly, Kiss Slowly, Love Truly, Laugh Uncontrollably And Never Regret Anything that Made You Smile.
Life May Not Be The Party We Hoped For, But While We're Here, We Should Dance. ~